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PCM78P Datasheet(Fiches technique) 3 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Numéro de pièce PCM78P
Description  16-Bit Audio ANALOG-TO-DIGITAL CONVERTER
Télécharger  16 Pages
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Fabricant  BURR-BROWN [Burr-Brown (TI)]
Site Internet  http://www.burr-brown.com
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®
PCM78
3
PIN
NAME
I/O
DESCRIPTION
1
Analog In
I
Analog Signal Input (1.5k
Ω impedance).
2–VCC
I
Analog power supply (–5V to –15V).
3
MSB Adjust
I
Internal adjustment point to allow adjustment of MSB major carry.
4+VDD
I
Power connection for comparator (+5V).
5
No Connection
No internal connection.
6
Comparator Common
I
Comparator common connection. Connect to ground.
7
MSB
O
Parallel output of bit 1 (MSB) inverted.
8
BTC/BOB Select
I
Two’s complement (open) or straight binary (grounded) data output format selection.
9
Status
O
Output signal held high until conversion is complete.
10
Clock Out
O
Internal clock output generated from RC network on pins 11 and 12 (also present when external clock is used lagging
external clock by ~24ns and same duty cycle).
11
R1C1
I
RC connection point used to generate internal clock. Sets clock high time. See text for details.
12
R2C2
I
RC connection point used to generate internal clock. Sets clock low time. See text for details.
13
SOUT2
O
Internal shift register containing the previous conversion result. (Alternate latched data output mode).
14
+VDD
I
Power connection for +5V logic supply.
15
SOUT1
O
Primary real-time data output synchronized to clock out.
16
External Clock
I
External clock input point (internal clock must be disabled).
17
Int/Ext Clock Select
I
Selects either internal or external clock mode (low = internal; open = external).
18
Short Cycle
I
Terminates conversion at less than 16 bits (open for 16-bit mode). See text for details.
19
Convert Command
I
Starts conversion process (can optionally be generated internally).
20
SOUT2 Latch
I
Latches previous conversion result for readout (must be issued with the SOUT2 clock to initiate latch and an internal convert
command).
21
SOUT2 Clock
I
Used to read out internally latched data from previous conversion.
22
Digital Common
I
Digital grounding pin.
23
+VCC
I
Analog supply connection (+5V to +15V).
24
VPOT
O
Voltage output (~2.5V) for optional adjustment of MSB transition.
25
Reference Decouple
I
Reference decoupling point.
26
Analog Common
I
Analog grounding pin.
27
Reference Out
O
2V reference out. Should not be used except as shown in connection diagram.
28
Speed Up
I
Connection point for a capacitor to speed reference settling. See text for details.
NOTE: Analog and digital commons are connected internally.
PIN ASSIGNMENTS
ABSOLUTE MAXIMUM RATINGS
+VCC to Analog Common ......................................................... 0 to +16.5V
–VCC to Analog Common ......................................................... 0 to –16.5V
–VDD to Analog Common .............................................................. 0 to +7V
Analog Common to Digital Common .................................................
±0.5V
Logic Inputs to Digital Common ................................. –0.3V to VDD + 0.5V
Analog Inputs to Analog Common ..................................................
±16.5V
Lead Temperature (soldering, 10s) ................................................ +300
°C
Stresses above these ratings may permanently damage the device.
DIGITAL OUTPUT
ANALOG INPUT
CONDITION
BTC
BOB
+2.999908V
+ Full Scale
7FFF Hex
FFFF Hex
–3.000000V
–Full Scale
8000 Hex
0000 Hex
0.000000V
Bipolar Zero
0000 Hex
8000 Hex
–0.000092V
Zero-1 LSB
FFFF Hex
7FFF Hex
INPUT/OUTPUT RELATIONSHIPS
PACKAGE INFORMATION
PACKAGE DRAWING
MODEL
PACKAGE
NUMBER(1)
PCM78P
28-Pin Plastic DIP
215
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.




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